Paper container with nonbuckling flanged head and process of making same



A. MOORE March 29; 1932.

PAPER CONTAINER WITH NONBUCKLING FLANQED HEAD AND PROCESS OF MAKING SAME Fi'led Jan 26 1924 m1 I'M! 1.1

ATTORNEY Patented Mar; 29, 1932 UNITED STATE- S" ARLINGTON moons,- or woncnsrnn, mssacnosnr-rs q PAPER CONTAHVEB 'WITH NONBUC KLI IING- FLANGE!) mG SAME HEAD .AND PROCESS 01' Application filed mam-m, 1924. serial 1a. sea-ms.

My invention relates to a paper-container with non-buckling flanged head and process The term paper is used of making same.

- herein for convenience to designate paper or other fibrous sheet materials having characteristics similar thereto.

When flanged heads of paper are drawn from a continuous blank or disc the radius of the flanged head is reduced from that of the blank by substantially the height of the flange, and the diameter is reduced to an extent substantially equal to twice the height Thus the material atand to- I of the flange. ward the margin of the flange, having been compressed in theformation of the flange to occupy only a fraction of its original diameter, has a tendency to expand.

When such a head is introduced into the interior of a container preparatory to being formed into parallel interlocked folds with the wall of the container body or shell, this tendency of the flange margin toward circumferential elongation or expansion is manifested by .an inward buckling. This inward buckling of the flange when it occurs at one or more places in the flange, interferes seriously with and may serve to prevent the suc-.

cessful formation of the head fiangeinto the parallel interlocked folds with the body wall, which is required to produce a satisfactory hermetic sealb being subsequently formed into a substantially welded seam of erma-J I nent gage dimension by application thereto of consolidating pressure, such for example 3 extent in the application of heads to'cylindrical paper bodies, is particularly trouble-- mterlocked' parallel folded seam as a pressureof three to five tons per square inch. This difiiculty, while appearing to some -ber of parallel folds.

a of the blank, thes e difficulties can be eliminated, and furthermore the'flange may be drawn or made considerably deeper than would otherwisebe possible. Such an extra deep flange is a feature of special utility where a higher multiplicity of parallel fold formations are made use of in making up the portion. 'In the accompanying drawings I have shown embodiments of the invention but it. is to be understood that same are for illustration only and not for imposing limitationson: the invention, changes and modifications thereof being within my invention, so long as same are included within'my claims, by which the scope of the invention is defined. In said drawings, Fig. 1 is a side view of a taper paper container or firkin partly broken away to show in section a bottom head inter locked in a consolidated parallel folded seam with the body wall. Fig. 2 is a central'vertical sectional view showing the introduction of a flanged head into a cylindrical body wall. Fig. 3 is a plan View of a circular notched disk for forming a flanged container head. Fig. 4 is a fragmentary vertical central sectional view showing the introduction of a flanged head part way into a tapered container body (such as the body of Fig. 1) to form the bottom head thereof; Fig.5 is view similar to Fig. 4, showing the flanged head pushed further down into positionfor interfolding' with the taper container body or shell. Fig.6 is a fragmentary cross-sectional view showing the body wall and head flange of Fig. 2 interlocked in parallel folds pre-, .paratory tocompletion of the closure seam by application thereto of conso 'datingpressure. Fig. 7 isa cross-section similar to Fi 6, but showing the closure seam after apphcation thereto of consolidating pressure, and Fig. 8 is a view similar to Fig 7, but showing a closure seam made up of an increased num- The head blank 10 (Fi 3) preferably of generally circular form, ut which may be of other forms, and which is to be flanged along the flange line indicated at 12, is pro vided with a series of peripheral notches 14, which are preferably of substantially, V-

form, as shown, and preferably spaced subpaper during the flanging operation to oocupy the open space of the notches, and second, the reduction in diameter from substantiall the original periphery of the blanked out ead 10 to a reduced diameter substantially the same as the diameter of flange line 12. It is suflicient for ordinary purposes that the notches 14 extend but part way inwardly from the edge of the blank 10 to the fold line 12. The particular depth of notch will, of course, vary with a number of various difli'ering factors, as the thicknesses of stock, depth of flange, depth of finished seam desired and number of folds in the seam.

The flanged discs 18 so'formed have many uses and can be used to advantage in many laces. In Figs. 1 and 5 such flanged disk 18 illustrated to form the bottom end or head 20 of a container or firkin comprising a tapered tubular body 22. When flanged discs that are not notched in accordance with my invention are introduced into the tapered tubular bodies to form containers they are liable to buckle in a number of places due to the squeezing together of the material of the 'flange as it is pushed down into the tapered container body, but where the flanged eads are notched as herein described, it is ssible to introduce them into a tapered tu- Eiilar body without any buckling, the forces which would otherwise produce buckling being effective only to bring the walls or ed of the notches substantially close toget er as indicated at 24, Fig. 5. When the ange 26 and body wall 28 are interlocked together in parallel folds, as, for example, five folds in the form shown in Fig. 6, (Fig. 6 is a detail for the form of Fig. 2, which shows a top head, but the position is merely reversed for a bottom head, as will be plain from Fig. 1) it becomes possible to produce the necessary turning over of headflange and body wall margin into parallel folds,

without any of the interference which would exist to such turning over in case the flange yhad buckled, and upon finally fabricating in Fig.

or consolidating the several thicknesses together by application of consolidating pressure, a consolidated and interlocked parallel fold joint, such as indicated at 30, Fig. 1 may be obtained.

Flanged heads made as described. are also useful in other connections, as, for example, 2 I have shown the application thereof in connection with the heading of cylindrical containers 32 having cylindrical tubular body walls 34. In such containers it is preferable to have the flanged heads 36 fabricating together of the vmargin of the flange when pushed into the container body pre-' liminary to the interlockingand fabricating steps of an external diameter slightly larger than the internal diameter of the shell. "For example, in shells of four inches in diameter I have found it desirable to make use of flanged heads 36 having an outside diameter of ten to twelve one-thousandths of an inch larger than the inside diameter of the shell 32. When flanged heads not notched in accordance with the present invention are so introduced, it frequently happens, due to the tendency of the flanged material to expand and due to compression exerted thereon by the shell into which it more inward bulges will be formed in the flange. When this happens the folding and flange and the is pushed, that one or I body wall are prevented at the points of buckling, and the container produced is crushed, instead of fabricated, at the point of buckling, and must be discarded. When, however, the blank has been preliminarily notched in accordance with the present invention, these difliculties do not arise, and

it becomes readily possible to secure a proper fabricated joint, and the body walls and flange may be folded together in parallel folds as in Fig. 6, and later the com lete fabrication thereof together complete as in the showing of Fig. 7. L

When extra deep flanges are to be drawn on the heads in order to be fabricated, for example, in making a' doubly folded joint, as the shown seven fold joint 40 in Fi 8, the use of notched head forming blanks comes a matter of specially great utility. The flange which can be drawn on an ordinary unnotched paper head of a given thickness is limited to a very moderate width or depth' by reason of the embrittling effect which is produced by the application of unduly high compression forces to the relativel thin bodied material of the-flang If it attempted, for example, to convert say a nine inch diameter unnotched disk of paper stock of about .0020 tbickness into a flanged head having a diameter of about three inches and a flan e depth of about three inches, and to have t e flange of substantially uniform thickness, it will be found that, if such operation were otherwise practicable, the stock at the outer would have to be so highly calendered and so tremendously compressed withinthe narrow space available that the fibre strength would be broken down and the material so weakened and embrittled as to break at the slightest touch. With the notched blanks, a very marked increase in depth of flange can be obtained without such resultant embrittling of the flan e margin, and the flanges produced are 0 relatively high cohesion and can be formed in strong parallel folds with the bodyfwalls, it bein possible in this way to secure a number 0 Ill of the flange inside or imbedded or buried within the complete interlocked joint, so that there can be no tendency to come apart or to exhibit what might be referred to as a tendenc') to unravel as mightbe present in a construction in which the split up or notched edge is ex osed as a raw edge. Thus the portions 42 in Figs. 6 and 7 and 42 in Fig. 8 show the notched part so imbedded or buried in the seam, the section being taken along lines including the closing lines v24 of the flange notches, as shown at a-q, Fig. 2. v

1. A seam for paper containers comprising a body wall, and a flanged head folded together in parallel interlocked folds, the flange having notches in the margin thereof.

2. The process of forming, a paper device which consists in taking a tubularbody member and a head havinga notched flange, as; sembling said tubular member and said head with the notched flange thereof engaging the wallvportion of said tubular member, and folding the contiguous portions of said tubular member and said notched flange together in interlocking relation.

1 3. The process of forming a paper device which consists in taking a tubular member and a head having a notched flange, assembling said tubular member and said head with the notched flange thereofengaging the wall portion of said tubular member, folding the contiguous portions of said tubular mem- I notches towards each other,

terrupted outer portion,

her and said notched flange together in interlocking relation, and subjecting the seam thus formed to high pressure. p

4. The process of forming a paper device which consists in taking a blank, forming a series of notches therein around the periphery thereof, forming a flange in said blank by deforming the same about a. line spaced inwardly from the inner ends of the notches and drawing the opposing edges of said whereby to produce a head having a flange including a substantially continuous iimer portion and an in-, taking a, tubular member, assembling said tubular member and said head with the notched flanged portion thereof engaging the wall portion of said tubular member at one end, and folding said contiguous portions together and pressing the same 'into interloc 'ng relation.

5. A paper device comprising a tubular member, a head closing an end of said tubular member and having a notched flange portion engaging the adjacent wall portion of saidtubular member; the contiguous portions of' said tubular member and said head be' folded together in interlocking relation.

6. A member, a head closing an endof said tubular member and having a notched flanged portion engaging the adjacent wall portion of said tubular member; the contiguous portions of said tubular member and said head bein folded together and the notched flanged portlon of said head being disposed within the folds of said wall portion.

7. A paper device comprising a tubular member, and a head closing an end of said tubular member and having a flange inc1uding a substantially continuous inner portion and a notched outer portion in engagement with the adjacent wall portion of said tubular member; the contiguous portions of said tubular member and said head'being folded together in interlocking relation.

8. A paper device comprising a tubular member and a head closing an end of said tubular member and-having a flange includng a substantially continuous inner portion and a notched outer portion in engagement with the adjacent wall portion of said tubular member; the contiguous portions of said tubular member and said head being folded together and compressed into interlocking relation, and the folded portions of said flange being enclosed by the contiguous folded portions of said tubular member. 7

9. The process of forming end seams in paper containers, which comprises forming a series of substantially V-shaped relatively narrow notches in about the periphery of an end disk for the container, flanging said disk about a line disposed inwardly from the innerends of the notches, whereby a drawn flange havmg a continuous inner portlon is produced, and the notches are substantially closed at and near the outer flange margin, introducing said flanged disk into a container body with the flange margin directed outwardly and lying against the interior ofthe body wall, infolding the body margin and flange margin into a plurality of folds, whereby the edges of both the body wall and the flange are enclosed, and applying consolidating pressure to the infolded parts, whereby same are brought into substantial parallelism and the folds parts are consolidated into a seam of substantially permanent dimension of high strength.

In testimony whereof, I have signed my ARLINGTON MOORE.

name hereto.

paper device comprising a tubular" 

